From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39F67C433EF for ; Sat, 4 Sep 2021 17:22:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF628601FF for ; Sat, 4 Sep 2021 17:22:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237143AbhIDRXs (ORCPT ); Sat, 4 Sep 2021 13:23:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236896AbhIDRXr (ORCPT ); Sat, 4 Sep 2021 13:23:47 -0400 Received: from mail-lf1-x133.google.com (mail-lf1-x133.google.com [IPv6:2a00:1450:4864:20::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0968C061575 for ; Sat, 4 Sep 2021 10:22:45 -0700 (PDT) Received: by mail-lf1-x133.google.com with SMTP id x27so4799093lfu.5 for ; Sat, 04 Sep 2021 10:22:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=98jOqbKpX72E4sPthsn4i3f66mKPjIJDIcd25lirePI=; b=eG78AXkrvMPYFu6Gt5/vrTdbimFDR9TXxplLlMw1nHmpyJUrQcTh/9wCJeHztK4N/O YH6b6mzsWGz7vhhhzfSL8IebU3Rub4K0pwZno/LNvT//BotGevQQBUiOT3pV0qZM6otl SWBcPAB7k8Xg5RezMwEmNMsTPJcn+HxEyK5cw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=98jOqbKpX72E4sPthsn4i3f66mKPjIJDIcd25lirePI=; b=fmzILq6M9fvJuMYY93KQ5hU8zqJeuz/J2Smlf3CMsPYANGao0fhM8b+w6py0R/JDSK owDGzNedItiBMatFNpbl3exB8KV5po1wwP9Z6hQgS7CxkMBtSw/ORu0a/DfcBhLDeXO3 CJFk84N9RM1kdmqgU8mOhPAHpbNYjH8T+njyS0kePaM0BcWSRojs+ojGxfOUhFP+I0ZW e6wWmxDQkE3QIiiRp6l/G5pAxf4tMXVzB2C80o+WpRndFRLuUhjuwyyYB1th3L381ONx FMKJpxLlPoaCbxatPQnEXa0TcnyYD28aRPSNVRri7I4215J+wqeDUhEUYEaGX491l9wX gVTQ== X-Gm-Message-State: AOAM5334U+mFA6Aqy4rmyCY7947jwvfpLyvk5bkJsXMgoa2CE2z3ABaD sAdZbuCeXTVChgupWsIZciz1TlcXj2HatAKS X-Google-Smtp-Source: ABdhPJzeFUpYjN91VQ+WGcmLcgpBysvqSZ/CpkDMtI4vYOL8jkBcraE45ftI082ELdOY09rn6J0fNw== X-Received: by 2002:a05:6512:3096:: with SMTP id z22mr3617348lfd.475.1630776163183; Sat, 04 Sep 2021 10:22:43 -0700 (PDT) Received: from mail-lj1-f178.google.com (mail-lj1-f178.google.com. [209.85.208.178]) by smtp.gmail.com with ESMTPSA id b19sm286706lfb.135.2021.09.04.10.22.41 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 04 Sep 2021 10:22:42 -0700 (PDT) Received: by mail-lj1-f178.google.com with SMTP id q21so3832909ljj.6 for ; Sat, 04 Sep 2021 10:22:41 -0700 (PDT) X-Received: by 2002:a2e:a363:: with SMTP id i3mr3513230ljn.56.1630776161685; Sat, 04 Sep 2021 10:22:41 -0700 (PDT) MIME-Version: 1.0 References: <3b461878-a4a0-2f84-e177-9daf8fe285e7@kernel.org> <878s0c4vng.fsf@oldenburg.str.redhat.com> <20210904131911.GP1583@gate.crashing.org> <871r644bd2.fsf@oldenburg.str.redhat.com> In-Reply-To: <871r644bd2.fsf@oldenburg.str.redhat.com> From: Linus Torvalds Date: Sat, 4 Sep 2021 10:22:25 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [GIT PULL v2] Kbuild updates for v5.15-rc1 To: Florian Weimer Cc: Segher Boessenkool , Nathan Chancellor , Masahiro Yamada , Nick Desaulniers , Linux Kbuild mailing list , Linux Kernel Mailing List , clang-built-linux , llvm@lists.linux.dev, linux-toolchains@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-toolchains@vger.kernel.org On Sat, Sep 4, 2021 at 8:19 AM Florian Weimer wrote: > > In any case, it would be nice to know what the real motivation is. I don't know about the original motivation, but the reason I like that patch after-the-fact is that I've actually been in situations where I test out self-built compilers without installing them. Then it's convenient to have a completely standalone kernel tree. Nobody cares about things like They are completely irrelevant for the kernel, exactly because we've always just done our own, or used __builtin_xyz() for things. is the only actual core header file that we have always taken from the installed system headers - because historically it really was required. Everything else we can just do ourselves. Linus